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Développement et implémentation dans le cadre éléments finis de modèles de comportement adaptés aux matériaux thermoplastiques élastomères en vue de la fatigue des structures

Abstract : This thesis, carried out in collaboration with Trelleborg Boots, aims to study the fatigue behaviour of bellows used to protect the cardan joints of motor vehicle front axles. During use, this grease-containing part is subject to fatigue stresses. It evolves in large transformation under extreme conditions between temperatures of -40 to 140°C. The materials used are Thermo Plastics Elastomers. The objective of the thesis is to determine a fatigue criterion to predict the life span of bellows. Damageable elastoplastic behaviour models with and without viscosity are available for finite element analysis. Mechanical fatigue tests were carried out. They made it possible to build a Wöhler curve. The ageing of the material due to grease has been studied through the evolution of its mechanical properties. Rapid self-heating tests have been proposed to determine the endurance limit of the TPE-E. A new indicator has been proposed to determine the endurance limit of TPE-E.
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Pierre Robard. Développement et implémentation dans le cadre éléments finis de modèles de comportement adaptés aux matériaux thermoplastiques élastomères en vue de la fatigue des structures. Mécanique des solides [physics.class-ph]. École centrale de Nantes, 2019. Français. ⟨NNT : 2019ECDN0051⟩. ⟨tel-02513120⟩

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